Pump-lubricator



C. C. FARMER.

PUMP LUBRICATOR.

APPLICATION FILED MAY 12, $920.

Patented July 19, 1921.

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Application filed ma 12,

To all whom it may concern:

Be it known that I, CLYDE C. FARMER, a citizen of the United States, residing at Edgewood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Pump-Lubricators, of which the following is a specification.

This invention relates to lubricating devices, and more particularly to an automatic lubricator for fluid compressors.

The principal. object of my invention is to provide an improved lubricator of the above character.

In the accompanying drawing; Figure 1 is a central sectional view of a lubricator embodying my invention and Fig. 2 a central sectional view of a lubricator embodying a modified form of the invention.

According to the construction shown in Fig. 1, the lubricator may comprise av casing 1 having an oil reservoir 2 of relatively large capacity, so that the oil level may be maintained at nearly the same point for a reasonable period of time.

Open to the reservoir 2 is a vertical chamber 3 and adjacent to the chamber 3 is a smaller chamber 1 connected to the chamber 3 by a passage 5 containing a ball check valve 6 for preventing flow from chamber 1 to chamber 3.

Leading from the top of chamber 3 is a passage 7 which is connected through a port 8 in a cock key 9 with a pipe 10 which leads to the air end of the fluid compressor. A

restricted port 11 connects chamber 4 with the oil reservoir 2.

In operation fluid compressed by the pump on the compression stroke flows through pipe 10 and passage 7 to the chamber 3 and thence past the check valve 6 through passage 5 to chamber 4.

On the suction stroke, the compressed fluid supplied to chamber 4: will pass through the restricted port 11 into the oil in the oil reservoir 2 and will fiow through the oil into the chamber 3 in the form of oil film bubbles.

Part of the oil film bubbles so formed will then pass out of the chamber 3 through passage 7 to the pipe 10, on the suction stroke, so that the air cylinder of the compressor will be lubricated thereby.

The amount of oil passed varies according to the distance through the oil Specification of Letters iat'ent.

rateate'iiaaiy is, 1e21,

1920. Serial No. 380,857.

it is necessarygfor the 'airtopass, so that by making the oil reservoir of relatively large capacity, the oil level remains reasonably stationary for a limited period of time, and the feed of oil is maintained substantially constant, provided the oil reservoir is replenished with oil at reasonable intervals.

The cock key 9 is provided with a through port 12, so that, if desired, oil may be manually supplied to the compressor by turning the cock key 9 to the position for connecting the pipe 10 with the reservoir passage 13.

A plug 1 1 is removed when it is desired to refill the oil reservoir 2 and when this is done, the cock 9 is turned so as to cut off communication through passage 7 in order to prevent blowing of air pressure upon removal of the plug.

In the construction shown in Fig. 2, the parts and the operation is substantially the same as that described in connection with Fig. 1, except that the hand operated cock is dispensed with and a spring pressed valve 15 is provided for controlling communication through the passage 7' and having a stem 16 adapted to be engaged so as to hold the valve 15 off its seat when the filling plug 14 is screwed home.

If the plug 14' is removed for filling the reservoir 2 with oil, the stem 16 will be released, permitting the valve 15 to be seated by its spring, thus automatically cutting off the flow of compressed fluid from the pump to the lubricator while the refilling is being done.

A slot 17 may be provided at the lower end of the plug 14:, so that as the plug is unscrewed but after the valve 15 is closed, any air pressure in the lubricator may escape before the plug is entirely unscrewed.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A lubricator for fluid compressors comprising a casing having an oil reservoir of relatively large capacity, an oil chamber of lesser capacity and connected with said reservoir, and. a chamber containing fluid under pressure from which fiuid flows through the oil into the oil chamber upon the suction stroke of the compressor.

2. A lubricator for fluid compressors comprising a casing having an oil reservoir subject to the pressure of fluid compressed by the compressor, a plug adapted upon re oil may be supplied to the reservoir, and

.valve means operated upon removal of the plug for closing communication through which fluid under pressure is supplied from the compressor to the lubricator and I upon application of theplug in positionfor openin said, communication. a

n testlmony whereof I have hereunto set my hand.

CLYDE o. FARME'R. 

